问题
选择题
E-shopping, when properly _____, can save us a lot of time and energy. [ ]
A. done
B. doing
C. to do
D. is done
答案
答案：A
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E-shopping, when properly _____, can save us a lot of time and energy. [ ]
A. done
B. doing
C. to do
D. is done
答案：A